Epidemiology of rheumatic disorders: problems in classification.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001168:Arthritis / Q000145:classification; D001172:Arthritis, Rheumatoid / Q000145:classification* / Q000453:epidemiology; D002170:Canada; D005060:Europe; D005260:Female; D006801:Humans; D007563:Jamaica; D007564:Japan; D008297:Male; D008875:Middle Aged; D012216:Rheumatic Diseases / Q000145:classification* / Q000453:epidemiology; D006113:United Kingdom; D014481:United States